21213220320343 has 2 divisors, whose sum is σ = 21213220320344. Its totient is φ = 21213220320342.

The previous prime is 21213220320337. The next prime is 21213220320367. The reversal of 21213220320343 is 34302302231212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213220320343 - 2⁹ = 21213220319831 is a prime.

It is a super-3 number, since 3×21213220320343³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213220320043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606610160171 + 10606610160172.

It is an arithmetic number, because the mean of its divisors is an integer number (10606610160172).

Almost surely, 2^{21213220320343} is an apocalyptic number.

21213220320343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213220320343 is an equidigital number, since it uses as much as digits as its factorization.

21213220320343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 21213220320343 its reverse (34302302231212), we get a palindrome (55515522551555).

The spelling of 21213220320343 in words is "twenty-one trillion, two hundred thirteen billion, two hundred twenty million, three hundred twenty thousand, three hundred forty-three".